[oletrucks] 90 mustang master cyl

["kmm 1024" <kmm1024@hotmail.com>]

I have a 90 mustang master cylinder and booster for my '53.  What is 
required to change it to be able to work with disc brakes in the rear?  I 
think there is a residual valve in it or something that might have to be 
removed.

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